FOBAMINIFERA OF NORTH PACIFIC OCEAN. 17 



LAGENA HEXAGONA (Williamson). 

 Plate 6, figs. 2, 3. 



Entosolenia squamosa Montagu, var. hexagona Williamson, Ann. Mag. Nat. 



Hist., ser. 2, vol. 1, 1848, p. 20, pi. 2, fig. 23; Rec. For. Great Britain, 1858, 



p. 13, pi. 1, fig. 31. 

 Lagena hexagona Siddall, Cat. Brit. Rec. For., 1879, p. 6. — Green, Amer. Journ. 



Micr., vol. 6, 1881, p. 46, pi., fig. 4.— H. B. Brady, Rep. Voy. Challenger, 



Zoology, vol. 9, 1884, p. 472, pi. 58, figs. 32, 33.— Egger, Abh. kon. bay. 



Akad. Wiss. Munehen, CI. n, vol. 18, 1893, p. 326, pi. 10, fig. 60.— Sidebottom, 



Mem. and Proc. Manchester Lit. and Philos. Soc, vol. 54, No. 16, 1910, 



p. 17, pi. 2, fig. 3. 



Description. — Test subglobular, broadly rounded at the apical end, 

 bluntly pointed at the apertural end, surface ornamentation consist- 

 ing of a reticulate pattern, the areoles of which are hexagonal, either 

 arranged in vertical rows or irregular. 



Length 0.25 to 0.50 mm. 



Distribution. — I have had this species from the following North 

 Pacific stations: Nero 1867 in 2,311 fathoms near the Midway Islands; 

 1603 in 1,733 fathoms and 1294 in 1,417 fathoms between Guam and 

 Yokohama; and Albatross D4957 in 437 fathoms and D5054 in 282 

 fathoms off Japan. 



In the specimens examined the arrangement of the reticulations 

 seems usually to be very irregular, but occasionally it assumes vertical 

 lines. 



LAGENA HEXAGONA (Williamson), var. SCALARIFORMIS (Williamson). 

 Plate 6, fig. 4. 



Entosolenia squamosa (Montagu), var. scalariformis Williamson, Rec. For. Great 



Britain, 1858, p. 13, pi. 1, fig. 30. 

 Lagena scalariformis Reuss, Sitz. Akad. Wiss. Wien, vol. 46, pt. 1, 1862 (1863), 



p. 333, pi. 5, figs. 69-71. 



Description. — Test similar in form to L. hexagona but differing in 

 the surface ornamentation, which is elongate hexagonal, the vertical 

 sides forming almost continuous costse, the sides of the reticulations 

 being thick. 



Length 0.33 mm. 



Distribution. — This form was noted at two North Pacific stations : 

 Tuscarora 5, lat. 37° 04' N.; long. 123° 22' W., in 1,200 fathoms, and 

 Nero station 201 in 1,033 fathoms near the Midway Islands. 



LAGENA FOVEOLATA Reuss. 



Plate 7, fig. 3. 



Lagena foveolata Reuss, Sitz. Akad. Wiss. Wien, vol. 46, pt. 1, 1862 (1863), p. 

 332, pi. 5, fig. 65.— Millett, Journ. Roy. Micr. Soc, 1901, p. 11, pi. 1, fig. 15.— 

 Sidebottom, Journ. Quekett Micr. Club, vol. 11, 1912, p. 395, pi. 16, fig. 15. 



Description. — Test pyriform, broadest toward the base, broadly 

 rounded at the apical end, gradually tapering to the slender neck at 

 the apertural end, surface ornamentation consisting of longitudinal 



